What Is Minority-Carrier-Lifetime?
Please is how we help researchers:
Buy Silicon Wafers Online!
We would like to order 25x DSP, n-typ, FZ, 100mm, 1-0-0, 275 µm and 100x DSP, n-typ, FZ, 150mm, 1-0-0, 275 µm with the following minimum requirements: 4” Material 6” Material Resistivity (Ohm-cm): < 3 Minority carrier lifetime (ms): > 5.8 > 13 Thickness (µm): 280 ± 10 Total Thickness Variation (µm): < 3 < 1.5 Bow (µm): < 2 < 3.5 Could you provide those and if send a quotation for that? Also due to new German regulations if you want to participate in the tender I would need you to sign the self-certification in attachment 2.
UniversityWafer, Inc. Replied:
The geometric specifications, specifically TTV, Bow and thickness tolerance, are extremely difficult. We can meet them, but the wafers would be very expensive. Also, I am surprised at the very tight specification on Bow without there being a corresponding specification on Warp. Please check if you can loosen some of your specifications.
We do have available 100mmØ FZ ingot and 150mmØ FZ ingot with resistivity <3 Ohmcm. However, I question if the Minority Charge Carrier Lifetime that you specified is achievable at the specified doping level (at Ro<3 Ohmcm).
The 100mmØ FZ ingot that we have available has resistivity (0.98-1.02)Ohmcm, but MCC Lifetime has not been measured on it.
Another such FZ ingot, from the same manufacturing process, with resistivity of 110 Ohmcm has measured MCC Lifetime of 11,558µs but with doping 30 to 100 times heavier, the MCC lifetime is bound to be much shorter.
The 150mmØ FZ ingot that we have available, with resistivity (1.01-1.02)Ohmcm, has measured MCC Lifetime of 1,571µs, but that is much shorter than you specified. Another such FZ ingot from the same manufacturing process, with resistivity of 16.8 Ohmcm has MCC Lifetime of 14,467µs but with heavier doping, the MCC lifetime is bound to be shorter.
If the ingots that we have available would be suitable for you then we would be happy to prepare a price quotation for the wafers that you specified.
Reference #252938 for wafer specs and pricing.
Get Your Quote FAST!
Minority Carrier Life Time of Silicon Wafers
After becoming a free electron in the conduction band, an electron gives up its energy and falls into a h ole in the covelent bond of the valence band. This is known as recombination.
This process is known as recombination. The time period from when an electron moves from the conduction band until recombination isa call the lifetime of the electron-hole pair. Thermal energy leads to the continual creation of electron-hole pairs followed by their recombination.
Below are just some silicon wafers that we sell with higher carrier lifetimes. Other specs and diameters in small and large quantities also available.
Item |
Dia |
Type/Dopant |
Orien |
Thick |
Pol |
Res ohm-cm |
Lifetime |
E239 |
150mm |
N/Ph |
(100) |
825um |
As-Cut |
FZ 7,025-7,856 |
7,562μs |
5325 |
150mm |
N/PH |
(100) |
725um |
DSP |
FZ 57-62 |
15,700μs |
6846 |
100mm |
P/B |
(100) |
250um |
DSP |
FZ 1-3 |
1,700μs |
6510 |
76.2mm |
P/B |
(100) |
350um |
DSP |
FZ 1-5 |
1,500μs |
References
Michael Quirk, Julian Serda, Semiconductor Manufacturing Technology